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jsspace 发表于 2014-7-2 10:56 
2 ]! [3 [3 T' D _8 n8 Y4 r7 K" T次级不能接地，这个在61347-2-13上已经明确说明了
依据IEC61347-2-13 Clause 8.2, 满足条件的SELV都可以被人接触到，为什么不可以接地？0 V" u) m* \/ i; O$ I2 i
! y3 t8 \$ j8 ]9 `- _- B8 E& ^6 z8.2 Output circuits of SELV- or SELV equivalent control gear may have exposed terminals if
7 c* W$ M% a* A* P9 p– the rated output voltage for constant voltage control gear or maximum output voltage for
; E J q7 k2 i0 q) g7 qconstant current control gear under load does not exceed 25 V r.m.s.;
6 R% ~/ G& o' B+ _– the no-load output voltage does not exceed 33 V r.m.s. and the peak does not exceed9 P- H: T2 x4 H) i
33 2 V.
* N6 S' d$ |, t8 T9 }& {9 N: P/ iCompliance is checked by measuring the output voltage when steady conditions are
; h) \! {/ O5 m! Lestablished, the controlgear being connected to rated supply voltage and rated frequency. For5 j m6 N5 x6 o W: I; z6 q
the test under load, the controlgear is loaded with a resistance which would give rated output
( p- `+ V$ c# V, s2 q( A" I# Eat rated output voltage.
. B/ r" h/ e. v9 `+ C: nFor controlgear with more than one rated supply voltage, the requirement is applicable for, r* |- |6 W. ?3 t" N
each of the rated supply voltages.6 }* }# o# B; ~3 Y$ q! V( e( F% I
Controlgear with a rated output voltage above 25 V shall have insulated terminals. |
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发表于 2014-7-2 10:56
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